Texas Instruments REF4132A25DBVR

Overview

REF4132A25DBVR from Texas Instruments is a precision 2.5 V CMOS series voltage reference with ±0.05% initial accuracy, 12 ppm/°C max temperature coefficient (A grade), 100 µA max quiescent current, ±10 mA output drive capability, and 15 µV_PP (0.1–10 Hz) low-frequency noise - deployed in high-resolution data acquisition systems requiring stable excitation for 24-bit ADCs.

For engineers reviewing the REF4132A25DBVR datasheet, REF4132A25DBVR pinout, REF4132A25DBVR application, or REF4132A25DBVR equivalent, key selection criteria include dropout voltage at 10 mA load (≤500 mV), thermal hysteresis (35 ppm), long-term stability (30 ppm/1000 hrs), and SOT-23-5 package compatibility with space-constrained industrial sensor nodes and portable test equipment.

Technical Context

The REF4132A25DBVR implements a trimmed bandgap core with integrated enable-controlled buffer, delivering regulated 2.5 V output from input voltages as low as V_REF + 50 mV. Its architecture minimizes thermal hysteresis via matched die layout and achieves low 1/f noise through optimized biasing and filtering of the reference core.

Operation spans −40°C to +125°C with guaranteed line regulation ≤2 ppm/V and load regulation ≤20 ppm/mA (0–10 mA sourcing). The EN pin provides digital control over output state, reducing quiescent current to 2.5 µA in shutdown while maintaining high-impedance VREF output.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with LM4132AMF-2.5/NOPB, REF4132A25DBVR delivers 4× better temperature stability and adds enable control; compared with ADR4525BRZ, it trades 9× lower IQ and 60% smaller footprint for 4× higher tempco - making REF4132A25DBVR optimal for battery-powered industrial DAQ where size, power, and moderate precision are balanced.

Availability

REF4132A25DBVR is available at Aetrix Electronics and suitable for PLC analog I/O modules, field transmitters, and battery test equipment requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for REF4132A25DBVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and communications markets.

The REF4132A25DBVR belongs to TI's precision voltage reference product line, engineered specifically for high-resolution data conversion systems where low drift, low noise, and micropower operation are critical in harsh-temperature environments.

FAQ

What is the maximum load current supported by the REF4132A25DBVR?

The REF4132A25DBVR supports ±10 mA output current - meaning it can source up to 10 mA and sink up to 10 mA while maintaining specified accuracy and stability. This capability enables direct driving of ADC reference inputs, op-amp bias networks, and small DAC loads without external buffering. Exceeding ±10 mA may cause output voltage deviation beyond the 0.05% initial accuracy spec.

Does the REF4132A25DBVR require an external output capacitor?

Yes, the REF4132A25DBVR requires a minimum 0.1 µF ceramic capacitor placed directly at the VREF pin for stability. TI specifies stable operation with 0.1–10 µF output capacitance; using X5R or X7R dielectrics is recommended. Omitting this capacitor risks oscillation and degraded noise performance, especially under dynamic load conditions encountered in data acquisition timing circuits.

How does the enable (EN) pin function on the REF4132A25DBVR?

The EN pin on the REF4132A25DBVR controls device activation: applying ≥1.6 V enables the reference output and draws ≤100 µA, while ≤0.5 V disables VREF (high-impedance state) and reduces quiescent current to ≤2.5 µA. Voltages between 0.5 V and 1.6 V must be avoided - they cause undefined behavior and elevated supply current. For always-on operation, tie EN to VIN.

What is the thermal hysteresis specification for the REF4132A25DBVR?

The REF4132A25DBVR has a thermal hysteresis of 35 ppm - defined as the output voltage change after cycling from 25°C → −40°C → +125°C → 25°C. This parameter reflects mechanical stress memory in the silicon and package; it directly impacts repeatability in calibration-critical applications like field transmitters and metrology-grade test equipment where thermal cycling is routine.

Can the REF4132A25DBVR be used to generate a negative reference voltage?

Yes, the REF4132A25DBVR can be combined with an op-amp such as the OPA735 to create a precision ±2.5 V dual supply from a single +5 V rail - as shown in TI's Figure 19. In this configuration, the REF4132A25DBVR provides the stable +2.5 V reference, while the OPA735 inverts and buffers it to produce −2.5 V. Matching R1/R2 temperature coefficients is essential to preserve common-mode rejection across temperature.